Details:
When using E-Notebook 22.1 or later with MS Office 365, exporting experiments or sections to MS Word might show the following error:
This can occur if then default save document type is not *.docx, to resolve the issue, set your default save format to *.docx on MS Word Options:
Open MS Word
Click Options
Click Save
On the setting "Save files in this format" select Word Document (*.docx)